Dell U2415 Monitor - Manual (Page 17)

About Your Monitor | 17
The OSD functions only in the normal operation mode. When any button is pressed in
the Active-off mode, one of the following messages will be displayed:
HDMI (MHL)/Mini DisplayPort/DP input
HDMI (MHL) input
Activate the computer and the monitor to gain access to the OSD.
NOTE: This monitor is ENERGY STAR
®
-compliant.